From: Mauricio Fernandez <mfp@...>
Date: 2006-09-08T00:50:45+09:00
Subject: Re: Has a method been called?

On Fri, Sep 08, 2006 at 12:23:10AM +0900, Jan Svitok wrote:
> On 9/7/06, aidy <aidy.rutter@gmail.com> wrote:
> >class Whatever
> >  @flag = 0
> >
> >  def method_called
> >    @flag += 1
> >  end
> >
> >  def has_method_been_called
> >    false
> >    return true if @flag > 0
> >  end
> >
> >end
> 
> If it's enough for you to know that off-line, you can use rcov or
> ruby-prof for that. Run rcov and see whether it's code was visited. If
> you need to know in the runtime, that's another story ;-)

You can do it with rcov's API:

RUBY_VERSION                                       # => "1.8.5"
require 'rcov'
class Foo;
  def foo; 1 end
  def bar; 1 end
end

analyzer = Rcov::CallSiteAnalyzer.new
analyzer.run_hooked do 
  f = Foo.new
  f.foo
end

def analyzer.executed?(selector); !!defsite(selector) end

analyzer.executed? "Foo#foo"                       # => true
analyzer.executed? "Foo#bar"                       # => false



However, in this case I'd rather intercept the method call, record it and
redispatch (standard alias_method/module_eval idiom, or define_method if the
redefined methods take no blocks or you're using Ruby 1.9).

-- 
Mauricio Fernandez  -   http://eigenclass.org   -  singular Ruby